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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7123725 | High intensity infrasonic tunable resonant acoustic test cell An apparatus and method are provided for high intensity acoustic test cells that employ the Helmholtz resonator principle, incorporating at least one moderately-sized volume or test cell that is tunable to a given infrasonic to low-sonic frequency and generates soun... | 10/17/2006 |
| 6831990 | System and method for image tamper detection via thumbnail hiding A semi-fragile image tamper detection system and method based on thumbnail hiding and which signifies the image areas in which tampering has occurred, is provided. A thumbnail is defined as a low-resolution version of an entire image or the significant features of a... | 12/14/2004 |
| 6728881 | Fingerprint and signature identification and authorization card and pen An authorization system uses card and signature devices to provide access to a machine. The devices include capacitance grids positioned on different surface regions of the devices to convert fingerprint images of at least two fingers into electrical signals. An ima... | 04/27/2004 |
| 6493651 | Method and system for determining magnetic attitude A system which derives the attitude of a body as it rotates and travels through the earth's magnetic field. At least one magnetometer is placed in the body and provides an output signal during flight of the body. The zero crossings of the output signal ar... | 12/10/2002 |
| 6414797 | Beamsplitter prism with spherical faces for transmitting or reflecting spherical waves without magnification A beamsplitter prism for transmitting and reflecting spherical waves without magnification, which includes at least first and second surfaces arranged opposite each other; a semi-reflecting layer diagonally arranged from a lower portion of the first surfa... | 07/02/2002 |
| 6411441 | Beamsplitter prism with cylindrical faces for transmitting or reflecting cylindrical waves without magnification A beamsplitter prism for transmitting and reflecting cylindrical waves without magnification, which includes at least first and second surfaces arranged opposite each other; a semi-reflecting layer diagonally arranged from a lower portion of the first sur... | 06/25/2002 |
| 6410917 | Polarization-sensitive corrugated quantum well infrared photodetector array A polarization-sensitive infrared (IR) detector array for use in infrared cameras and other IR based instruments, is comprised of multiple corrugated quantum well infrared photodetector elements (C-QWIP) that form a unitary detector unit (cell). The array... | 06/25/2002 |
| 6401621 | Electronic safe and arm apparatus for initiating a pyrotechnic An electronic safe and arm apparatus disposed in a projectile having a spin axis and a spin rate includes a battery; a power supply board connected to the battery, the power supply board including a mechanical G-switch that closes permanently at a predete... | 06/11/2002 |
| 6398155 | Method and system for determining the pointing direction of a body in flight A method to determine the direction in which a spinning projectile is traveling. A solar sensor array on the projectile is used to calculate the orientation of the axis of rotation of the projectile with respect to a known solar field and a magnetometer s... | 06/04/2002 |
| 6358386 | Multilayered conformal coatings of tunable, low electronic loss ceramic composites and method of production A method of producing multilayered conformal coatings of tunable, low electronic loss ceramic composites is carried out by mixing two-phase BSTO/MgO into a base solution of typical lab grade acetone to form a mixed solution, inserting two platinum sheets ... | 03/19/2002 |
| 6345785 | Drag-brake deployment method and apparatus for range error correction of spinning, gun-launched artillery projectiles In a projectile launched by a gun, the projectile including a fuze with a longitudinal axis of symmetry and a braking device, an apparatus disposed in the fuze for determining a time of deployment of the braking device, the apparatus including a first acc... | 02/12/2002 |
| 6319214 | Valve-less fluid control circuit for rhythmic action devices A valve-less fluid control circuit for controlling rhythmic action devices, such as circulatory assist devices. The fluid control circuit has a plurality of pressure sensitive fluid oscillators for circulating a fluid. Each fluid oscillator includes a cap... | 11/20/2001 |
| 6259096 | Guanine Cytosine (GC)-rich DNA/PNA microbolometer This invention is related to the field of uncooled infrared (IR) detector technology, and it particularly demonstrates the use of thin film structures on oxidized silicon consisting of Guanine Cytosine (GC)--rich double-stranded DNAs and peptide nucleic a... | 07/10/2001 |
| 6247408 | System for sympathetic detonation of explosives A system is disclosed that remotely activates one or more explosive charge by sympathetic detonation (i.e., not requiring explosives to be interconnected by wire). The system includes electronics that control the activation of each explosive charge and wh... | 06/19/2001 |
| 6249421 | Electrostatic actuation control system Electrostatic actuation arrangements are disclosed comprising of at least two wafers and having electrodes formed on their facing surfaces. One of the wafers has holes in it while the other wafer has posts extending therefrom. The holes and the posts are ... | 06/19/2001 |
| 6245707 | Methanol tolerant catalyst material Methanol tolerant catalyst materials and a method of making the same are provided. These novel catalyst materials are obtained by mixing together and heat-treating at least two different transition-metal-containing nitrogen chelates. In preferred embodime... | 06/12/2001 |
| 6239873 | Apparatus for simultaneous measurement of two polarization states of scattered light A device for simultaneous measurement of two polarization states of scattered light includes an illumination unit having first and second lasers for providing first and second beams of polarized light λ1 and λ2, which have differen... | 05/29/2001 |
| 6232909 | Communication network optimization tool This invention identifies a process for determining the performance of radio frequency (RF) links in the Army's Enhanced Position Reporting System (EPLRS) with a high level of statistical confidence. The method includes determining a statistical differenc... | 05/15/2001 |
| 6207892 | System and method for sealing high density electronic circuits A method and system for extending the life cycle of an circuit including the positioning of a circuit on an an elevated pedestal in a container, filling the container with a hydrophobic fluid sufficiently to form a bubble at the top of the package, and se... | 03/27/2001 |
| 6198404 | Small weapon decoy for military use A small, portable, low cost, battery operated, radio-controlled decoy simulates the sound of small arms fire. The units may be deployed remotely in the field to distract and confuse defending forces when attacked by advancing or infiltrating forces.... | 03/06/2001 |
| 6183715 | Low polarizability of Sb5+ for use in fabrication of low dielectric constant materials The microwave properties of numerous perovskite antimonates like A2 MeSbO6 where A=Ba or Sr, Me=a rare earth, Y, Sc, Ga, or In and A4 MeSb3 O12 where A=Ba or Sr and M=Li, Na or K were measured at 10 G... | 02/06/2001 |
| 6178276 | End-pumped waveguide optical splitter-amplifiers based on self-imaging The invention discloses devices and methods of manufacturing devices for the splitting and amplification of light signals by use of an end-pumped waveguide optical device, based on either (a) self-imaging multiplexing of the signal and pump light, then am... | 01/23/2001 |
| 6175337 | High-gain, dielectric loaded, slotted waveguide antenna A high-gain, dielectric loaded, slotted waveguide antenna having a photonic bandgap, a high-impedance electromagnetic structure, in contact with the waveguide surface containing longitudinal slots, and a tailored dielectric material structure in contact w... | 01/16/2001 |
| 6172642 | Radar system having a ferroelectric phased array antenna operating with accurate, automatic environment-calibrated, electronic beam steering A radar system has a transceiver and a ferroelectric phased array antenna. The antenna includes a plurality of radiating elements each connected to a ferroelectric phase shifter. The transceiver and the phase shifters are coupled for conveyance of radio f... | 01/09/2001 |
| 6172486 | Battery life extender with engine heat A lead acid battery life extender for the battery of an internal combustion engine includes a multivibrator circuit electrically connected across the terminals of the battery for delivering high frequency electrical pulses to the battery, thereby removing... | 01/09/2001 |
| 6160257 | Hybridized biological microbolometer A Microbolometer constructed of Biological and Non-Biological components, ing proteins with greater sensitivity to imaging, as the infrared radiation detectors.... | 12/12/2000 |
| 6120461 | Apparatus for tracking the human eye with a retinal scanning display, and method thereof A retinal scanning display, an active-pixel image sensor array, and an im processor track the movements of the human eye. The scanning nature of the display acts as a sequential source of eye illumination. The active-pixel image sensor array is directed ... | 09/19/2000 |
| 6092058 | Automatic aiding of human cognitive functions with computerized displays An automatic aider of human cognitive functions for the operation of computerized displays. The invention estimates in real-time the mental decision made in response to a displayed stimulus from the single-even, transient, evoked cerebral potential and th... | 07/18/2000 |
| 6064013 | Miniature, planar, inertially-damped, inertially-actuated delay slider actuator A miniature, planar, inertially-damped, inertially-actuated delay slider uator is micromachined on a substrate and consists of a "slider", with zig-zag or stair-step-like patterns on the side edges, interacting with similar vertical-edged zig-zag pattern... | 05/16/2000 |
| 6050822 | Electromagnetic locomotion platform for translation and total immersion of humans into virtual environments The present invention, an Electromagnetic Locomotion Platform (ELP) system, is an electronically powered device which allows human-like activities to be performed in all three axes: x, y, & z, in a confined and localized a for the purpose of attaining ... | 04/18/2000 |
| 6052292 | Tridirectional inverter A tridirectional inverter is disclosed which converts power from the single source into two different widely types of power outputs. This conversion s done by utilizing a magnetic element, i.e., a transformer, alternatively as a filter and as a voltage ch... | 04/18/2000 |
| 6039262 | Passive bimetallic actuator for heat transfer The invention is a bimetallic actuator for heat-transfer applications where the source of energy is provided by a temperature difference between two eservoirs or the temperature change of the ambient. The actuator requires no external source of power for ... | 03/21/2000 |
| 6028624 | Method and apparatus for increased visibility through fog and other aerosols A system is described that uses chopped laser illumination, chopped and fered wide baseline stereo imaging, specular reflectors along the path to navigated, comparison of the two stereo images collected to determine and subtract from the images the magni... | 02/22/2000 |
| 5923459 | Accusto-optic time-integrating correlator for processing broadband doppler-shifted signals This invention relates to an acousto-optic time-integrating correlator for rocessing broadband Doppler-shifted signals. The present invention uses a conical lens telescope to compensate, in one dimension, for the differences in the absolute values of Doppl... | 07/13/1999 |
| 5909275 | G-hardened optical alignment sensor An optical alignment device having a sensor housing with obstructing geomy which restricts the amount of sunlight that enters the sensor and impinges upon a photoelectric cell within the sensor body. The restriction of light properly maintains a constant... | 06/01/1999 |
| 5900331 | Thermal battery with reduced self-discharge A thermal battery has an electrolyte-cathode layer; an anode layer adjacent he electrolyte-cathode layer; a steel cell cover adjacent the anode layer; an insulating layer adjacent the steel cell cover, the insulating layer having a volume resistivity in th... | 05/04/1999 |
| 5847677 | Random number generator for jittered pulse repetition interval radar systems A random number generator for generating a pseudo-random code for use with ittered pulse repetition interval radar systems has been disclosed in which the code generated by the random number generator possesses the five attributes desirable for a jittered ... | 12/08/1998 |
| 5847312 | Shaped charge devices with multiple confinements A shaped charge device having at least a double confinement configuration d utilizing a standard shaped charge liner inserted into a hollow cavity in the inner explosive fill. The inner explosive fill is surrounded by an inner confining case which may be ... | 12/08/1998 |
| 5838842 | Self-imaging waveguide optical polarization or wavelength splitters Two new techniques for the separation of orthogonally polarized light or ht of 2 arbitrary wavelengths by use of a waveguide optical device, based on either 1) simultaneous crossed and barred 1-by-1 off-center self-imaging, or 2) out-of-phase self-imagin... | 11/17/1998 |
